Lockheed Martin's hypersonic spy plane, the SR-72, may be in production in secret, emerging evidence suggests

Lockheed Martin's hypersonic spy plane, the SR-72, may be in production in secret, emerging evidence suggests

Lockheed Martin

Lockheed Martin's mysterious hypersonic aircraft known as SR-72 appears to be continuing its march toward service, but the program is not immune from the Air Force's broader budgetary woes.

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